This gets confusing when working with both busybox and bash, as most of
our systems do. If you install busybox after bash, such as by cd
tools/apps/busybox; make, then /bin/bash -> busybox.

It seems nice to have the bash symlink get covered by busybox, but then
again, on Akaros, the #!/bin/bash line doesn't get handled by the
kernel. The shells just run the script internally, so they don't
handler the interpreter line. Parlib doesn't even do it - it runs
"/bin/sh WHATEVER."